Datasheet

Datasheet
Datasheet
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BD9271KUT
TSZ02201-0F1F0C100260-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
27.Feb.2015 Rev.004
www.rohm.com
TSZ22111・15・001
PWM dimmingoperation mode
VCC
DVDD
12V
3.3V
STB
VSYNC
12 3
11 12 13
HSYNC
S1～16
0.3V
H
ERR_DET
Settings of PWM dimming operation mode
・VSYNC=PWM dimming signal（Input the pulse signal for PWM dimming to VSYNC.）
・HSYNC=GND（Setting for abnormal detection）
When you use the PWM dimming mode, please follow the sequence below.
① Input the power supply of VCC and DVDD.
② Launch the STB from L to H.
③ Input the pulse signal to VSYNC.
PWM dimming operation mode (with abnormol detection function)
Setting of PWM dimming
・ VSYNC: PWM dimming signal (To input a pulse for PWM dimming to VSYNC pin)
・ HSYNC: 4096 counts during 1cycle of VSYNC signal
Control the PWM operation of
LED output with PWM signal
inputted to VSYNC.
※Because the protection
functions are masked, the
lighting by LED abnormal
cannot proceed.
②
①
③
The abnormal detected CH of LED
will be OFF, after VSYNC pulse
count of 12.
At the same time, ERR_DET output
to ERROR
(“ERRDET=L” is abnormal)
Figure 21. Starting Sequence for PWM dimming1
Figure 22. Starting Sequence for PWM dimming2
abnormal
normal
Number of count